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Патент USA US3078083

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Feb. 19, 1963
B. F. GOLDEN
V
3,078,072
LEVELING DEVICE FOR DERRICKS
Filed April 7, 1960
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Bobby 5 Golden
INVENTOR.
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Feb. 19, 1963
B. F. GOLDEN
3,078,072
LEVELING DEVICE FOR DERRICKS
Filed April 7. 1960 _
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LEVELING DEVEQE FUR DERREEZS
Bobby F. Golden, Box 1125, Kermit, Tex.
Filed Apr. 7, i960, Ser. No. 26,749.
7 Claims. (El. Zed-1M)
This invention relates to a novel and useful leveling
attachment for derricks, and more particularly to a level
These together with other objects and advantages which
will become subsequently apparent reside in the details of
construction and operation as more fully hereinafter de
scribed and claimed, reference being had to the accom
panying drawings forming a part hereof, wherein like
numerals refer to like parts throughout, and in which:
FIGURE 1 is a front elevational view of a jackknife
type derrick shown with the leveling attachment compris
ing the present invention disposed between the front legs
ing attachment speci?cally adapted for use in leveling
jackknife derricks.
10 of the A-frarne and the sub-structure or base of the der
The most conventional forms of jackknife derricks are
provided with a sub-structure or base which forms a
rick;
FIGURE 2 is a side elevational view of the derrick as
foundation for the mast of the derrick. The derrick also
seen from the left side of FIGURE 1;
includes an A-frame having two pair of depending legs.
FIGURE 3 is an enlarged longitudinal vertical sectional‘
Each pair of depending legs of the A~frame are parallel 15 view of the leveling attachment taken substantially upon a’
and the mast of the derrick is provided with two inclined
plane passing along the center line thereof;
legs which are pivotally secured at their lower-most ends
FIGURE 4 is an enlarged top plan view of the leveling
to the lower portions of one pair of A-frame legs. The
attachment;
angulated legs of the mast extend along the one pair of
FIGURE 5 is an end elevational view of the leveling at
A-frame legs and are secured at their upper end to the 20 tachment as seen from the right side of FIGURE 3; and
upper ends of the one pair of A-frame legs. The two legs
FIGURE 6 is a transverse vertical sectional view taken
of the mast section are pivotally secured to the lower por
substantially upon a plane indicated by section line 6—6.
tions of the one pair of A-frame legs for movement about
of FIGURE 3.
an axis of rotation extending between the lowermost ends
Referring now more speci?cally to the drawings the
of the mast legs. The mast section of the derrick may 25 numeral ltl generally designates a jackknife type of der->
then be pivoted from an upstanding position to a hori
rick having a mast section generally referred to by the
zontally disposed position for ease of transporting from
reference numeral 12 and an A-frame supporting member
one locality to another. When it is desired to erect the
generally referred to by the reference numeral 14-which
mast section of the derrick, it is rotated to a substantially
includes a pair of rear legs 16 and a pair of front legs 18.
vertically disposed position and then secured to the upper 30 The jackknife derrick 19* is supported by a sub-structure
portions of the legs of the A-frarne.
or base generally referred by the reference numeral 20
It is of course extremely important that the sub
which is in turn supported by the ground 22 on which the
structure or base of the derrick be level so that when the
(I
derrick 19 is placed. The mast section 12 inc‘udes acrown
mast section is raised it will be disposed substantially
safety platform 24 and a racking platform 2.6.which are
vertically. In many cases however, the sub-structure or 35 of conventional design. The mast 12 includes a pair of
base of the derrick will settle along one side edge thereof
inclined legs 23 which are pivotally secured at their lower-,
and the only previous effective means of leveling the sub—
most ends to foot members 30 that are secured to the
structure was to wash the ground out from under the high
lowermost ends of the forward legs 18 of the A-frame 14.
side of the sub-structure or base. Quite frequently, how
Each of the rear legs 16 of the A-frame 14 also includes a
ever, the result of this operation would be that too much
‘foot member 32 which is pivotally secured thereto.
soil or dirt would be removed then necessitating the soil
Ordinarily, each of the foot members 30 and 32 are
be washed out from beneath the original low side of the
rigidly secured to the sub-structure or base 2t}. in any
sub-structure or base.
The present invention provides a means whereby the
pair of legs of the A-frarne to which the legs of the mast
are secured may be adjustably and vertically positioned
convenient means such as by bolting or welding. The
sub-structure or base 2% is positioned on the ground 22.
in a horizontally disposed position and the mastlZ may
be pivoted between a horizontally disposed position and an
upstanding position such as that shown in FIGURE 2
relative to the sub-structure or base of the derrick so that
the mast may be maintained in a substantially vertically
about an axis 35 extending between the lowermost ends of
disposed position. It is to be noted that the present in
the legs 23 of the mast 112.
With particular attention directed to FIGURE 2 of
vention will also, in addition to adjusting the forward 50
the drawings it will be noted that the legs 28 of the mast
and rearward inclination of the mast, also enable the side
12; have at least a portion thereof extending along the
ways inclination ofthe mast to be adjusted.
The main object of this invention is to provide a level
forward legs 18 of the A-frame lid. The uppermost
ends of those portions of the legs 25 are secured to the
ing attachment for jackknife derricks and the like which
will enable the mast of the derrick to be maintained in a 55 upper end of the A-frame 1.4 in any convenient manner
substantially vertically disposed relation.
as at 38 when it is desired to maintain the mast 12 ina
A further object of this invention, in accordance with
the immediately preceding object, is to provide a leveling
vertically disposed position.
In some cases, due to inclement weather and other fac—
tors, the sub-structure or base 23 will settle somewhat
attachment which will also enable the drilling string to be
maintained centrally disposed relative to the rotary table 60 causing the mast 12. to incline from its substantially ver
tically disposed position. This inclination of the mast
of the derrick.
12 not only unbalances the normal stresses on the der
Yet a further object of this invention is to provide a
rick 16 but also causes the drilling string to be located
leveling attachment which may be easily adapted to sub
off-center with respect to the rotary table of the derrick
stantially every type of jackknife derrick to perform its
desired function.
65 lid. This of course causes the drill string to rub against.
the sides of the rotary table and considerable time is
A ?nal object to be speci?cally enumerated herein is to
lost during the operations of trying to set the slips in
provide a leveling attachment which will conform to con
making connections in the drilling string. Further, the
ventional forms of manufacture, be of simple construc—
wear of the drilling string is also greatly increased;
tion and easy to operate so as to provide a device that will
be economically feasible, long lasting and capable of per 70 The leveling attachment comprising the present inven
tion is generally designated by the reference numeral 4ft
forming its desired function with a minimum amount of
effort on the part of the workman handling the derrick.
and it will be noted that a pair of levelling attachments
aoraore
3
4
41) are interposed between the lowermost ends of the legs
3i? secured to the lower ends of the front legs 13 of the
28 of the mast 12 and the sub-structure or base 2%},
see FIGURES l and 2.
A-frame 14 and these stresses tend to urge the lower ends
The levelingattachment 40 includes a base generally
designated by the reference numeral 42 which may be
of the front legs 18 toward the rear legs 16. The end
wall 43 reinforced by gussets 80 provides the additional
strength needed when raising the mast section 12 to
rigidly secured to the sub-structure or base 20 in any
a vertical position and de?nes thrust bearing means for
preventing longitudinal shifting of the lift section toward
convenient manner. A housing generally designated by
the legs 16.
the reference numeral 44 extends upwardly from the base
Further, the lift section 60 is provided with a plurality
42 and includes a pair of side walls 46 and a pair of end
walls 48. The side walls 46 and end walls 48 of the 10 of vertical bores 82 which receive the upper ends of
studs 84. The studs 84 have their lower ends rigidly
housing 44 are secured together in any convenient means
secured to the base 42 and threaded fasteners 86 are
such as by welding 50 although it is to be understood that
secured to the upper threaded ends of the studs 84 for
bolts and/ or rivets may be used such as bolts 52 which
limiting the movement of the lift sections 60 away from
are utilized to secure the lower edges of the housing 44
to the outer peripheral edges of the base 42.
15 the base 42.
In operation, if it is desired to move the upper end
A pair of wedge members 54 are disposed in said hous
of the mast 12 as seen in FIGURE 2 to the left in order
ing for sliding longitudinal movement therein over the
to bring it to a vertical position, after the attachment
upper surface of the base 42. The base 42 is provided
10 has been secured between the foot members 30 car
with a pair of longitudinally extending channels which
are parallel and each of the wedge members 54 has 20 ried by the legs 28 and the substructure or base 20 and
spacer blocks 38 have been disposed between the foot
formed on its lower surface two longitudinally extend
members 32 and the sub-structure or base 20 to compen
ing ribs 53 that are slidably disposed in the channels 56
sate for the mean vertical height of the attachment 10,
for movement therealong.
the screw shaft 68 is rotated in a clockwise direction as
A lift section generally designated by the reference
seen from the right side of FIGURE 3 in order to move
numeral 60 is slidably disposed in the housing 44, which
the wedge members 54 away from each other and thereby
de?nes thrust bearing and guide means, for vertical move
increase the vertical height of the lift member 6|) above
ment toward and away from the base 42.
the base 42. This will in e?ect lengthen the front legs
It will be noted, see FIGURE 4, that the lift section 60
18 of the A-frame 14 in order to move the upper end
is snugly received within the side and end walls 46 and
of the mast 12 to the left in FIGURE 2 of the drawings.
48 and that it is provided with a pair of oppositely in
It will be noted that the side walls 46 of the housing
clined lower surfaces 62 which are complementary to
the oppositely inclined upper surfaces 64 of the wedge
members 54.
The wedge members 54 are provided with threaded
bores 66 and the bores 66a and 66b are oppositely
threaded. A screw shaft generally referred to by the ref
erence numeral 68 has its opposite end portions journalled
through the end walls 48 of the housing 44 by means of
bearing assemblies 70. The opposite end portions of the
screw shaft 68 disposed inwardly of the bearings 70 are
oppositely threaded and are threadedly engaged with the
bores 66a and 66b. One end portion of the screw shaft 63
is provided with a noncircular extension 72 to which suit
able means (not shown) may be secured for e?ecting rota
tion of the screw-shaft 68. It will be noted that upon rota
tion of the screw shaft 63 that the wedge members 54 will
be moved toward and away from each other between the
end walls 48 of the housing 44. As the wedge members
are moved apart, the lift section 60 is raised and when
the wedge members are moved toward each other the
lift section 60 is lowered toward the base 42. The in
clined surfaces 64 of the wedge members 54 are each
provided with at least one rib portion '74 which is slida
bly received in a channel 76 formed in the inclined sur
faces 62 of the lift section 69. Thus, not only do the
walls 46 and 48 of the housing 44 guide the movement
of the lift sections 60 toward and away from the base 42,
but the ribs 58 and 74 engaged in the channels 56 and 76
respectively also resist movement of the lift section 60
transversely of the base 42. Inasmuch as the axis of
rotation 30 of the mast 12 extends at right angles to
the sliding movement of the wedge members 54, the ribs
58 and 74 resist movement of the legs 28 of the mast 12
along the axis of rotation of the mast 12.
It will be noted that the end wall 43 of the housing
44 remote from the non-circular extension 72 is provided
with a horizontally disposed base ?ange 78. A plurality
44 are provided with upwardly opening V-shaped notches
90 in order that the position of the lift section 60 relae
tive to the base 42 may be observed. Further, it is to be
35 understood that registering adjacent surfaces of the edges
of the V-shaped notches 90 and the inclined surfaces
62 of the lift section 60 may be provided with suitable
indicia so that the adjustment of the attachment 10 may
be effected in an accurate manner.
40
The foregoing is considered as illustrative only of the
principles of the invention. Further, since numerous
modi?cations and changes will readily occur to those
skilled in the art, it is not desired to limit the invention
to the exact construction and operation shown and de
scribed, and accordingly all suitable modi?cations and
equivalents may be resorted to, falling within the scope
of the invention as claimed.
What is claimed as new is as follows:
'1. A jack comprising a ?at elongated plate-like base,
50 a pair of wedge members slidably disposed on the upper
surface of said base for movement longitudinally of said
base toward and away from each other, an elongated lift
section overlying said wedge members extending longi
tudinally of said base and provided with oppositely in~
55 clined lower surfaces, each of said wedge members having
an inclined upper surface complementary to and in sliding
contacting relation with one of said inclined lower sur
faces of said lift section, means secured between said
wedges for adjusting the distance therebetween whereby
60 the distance between said base and lift section may be
varied, guide means on the upper and lower surface of
said wedge members engaging the adjacent portions of
said lift section and base respectively and restricting
sliding movement of said wedge members along said base
65 and lift section to movement longitudinally thereof, and
thrust bearing means rigidly secured to said base and dis
posed in sliding contacting relation with said lift section
preventing longitudinal shifting of said lift section in one
of gussets 80 are secured between the upper surface of
the base ?ange 78 and the outer surface of the adjacent
drection.
2. The combination of claim 1 wherein said thrust
end wall 48. The gussets 80 provide a considerable 70
bearing means comprists an upstanding tubular housing
amount of extra strength to the end wall 43 and it will
rigidly secured to said base enclosing said wedge mem
be noted that the end wall 48 is disposed adjacent the
bers and in which said lift section is snugly and slidably
rear legs 16 of the A-frame 14.
received.
When the mast 12 is being raised to a vertical position,
3. The combination of claim 2 wherein said housing
considerable stresses are placed upon the foot members 75
3,078,072
5
6
includes one end wall opposing longitudinal shifting of
said lift section provided with heavy external bracing
adjusting means including a screw shaft having oppositely
threaded end portions, means journalling said shaft
from said base.
4. The combination of claim 1 wherein said thrust
bearing means slidably engages said lift section and limits
movement of the latter to that of at right angles to the
movement of said wedge members.
5. The combination of claim 1 including adjustable
means carried by said base and engaging said lift section
for limiting movement of the latter from said base.
10
6. The combination of claim 1 wherein said thrust
bearing means slidably engages said lift section and limits
movement of the latter to that of at right angles to the
through opposite ends of said housing.
movement of said wedge members, said thrust bearing
means including a vertically extending hollow housing se~ 15
cured to said base and slidably receiving said lift section,
oppositely threaded bores formed through and extending
in the direction of travel of said wedge members, said
7. The combination of claim 1 wherein each of said
guide means includes at least one outwardly projecting
and longitudinally extending rib, at least one longitu
dinally extending groove formed in said base and said lift
members slidably receiving said ribs.
References Cited in the ?le of this patent
UNITED STATES PATENTS
466,650
722,753
2,570,901
2,847,098
Bogen et al _____________ .._ Jan. 5,
Rhodes et a1 __________ __ Mar. 17,
Woolslayer et a1. _______ __ Oct. 9,
Heinish ______________ __ Aug. 12,
1892
1903
1961
1958
FOREIGN PATENTS
4,437
Great Britain ______________ .._. of 1878
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